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Southeast Michigan

Corewell Health System, Southeast Michigan, Southwest Michigan, West Michigan

Update on Corewell Health and Quest Diagnostics Joint Venture

Dear Valued Client:

We are pleased to announce that Corewell Health and Quest Diagnostics, a leading national laboratory company, have completed the formation of their laboratory services joint venture (JV) named Diagnostic Lab of Michigan, LLC.

This multifaceted collaboration will broaden access to innovative, high-value laboratory services for you and other providers in Michigan. Excitingly, work has begun on a new state-of-the-art laboratory in Southfield, Michigan, to service the JV. This laboratory will not be operational until the beginning of 2027. We will provide updates on the laboratory start date as work progresses.

Improving Access to Diagnostic Innovation in Michigan Over Time

Corewell Health and Quest Diagnostics share the goal to broaden access to quality, accessible and affordable laboratory services for providers and patients in Michigan. We expect Diagnostic Lab of Michigan to concentrate the shared resources and expertise of Corewell Health and Quest Diagnostics on improving access to diagnostic innovation in Michigan.

Over time, Diagnostic Lab of Michigan will provide several new benefits, including:

• Greater convenience for patients, as Corewell Health and Quest Diagnostics combine their patient service networks to reach more patients in Michigan.
• Michigan-grown diagnostic innovation, including through automation in the new laboratory.
• Broad health plan access to support patient affordability.

Your current Corewell Health Lab Account Representative will continue supporting you as part of the new joint venture laboratory. If you have questions, please contact Matt Boring, Sales Director, 248-345-5604.

We appreciate your business and look forward to the continuation of high-quality laboratory services for our patients, providers and communities.

Sincerely,

Sarah Britton
Vice President, Laboratory Services
Corewell Health

Corewell Letter to Clients Close

Referral/Sendouts, Southeast Michigan

Meconium Drug Screen Testing Update

Effective December 3, 2025, meconium drug screen testing for Southeast Michigan will transition from ARUP to Corewell Health Reference Laboratory West.

This change ensures consistent, high-quality testing across all Corewell Health regions and clinically standardizes the services we provide as a system.

What’s Changing:

Southeast Michigan specimens will now be tested at Corewell Health Reference Laboratory West

Collection and transport processes remain unchanged.

Purpose of Test:

Meconium drug screen testing detects and documents fetal drug exposure during approximately the last trimester of a full-term pregnancy

For more information, please refer to the Lab Test Directory: Meconium Drug Testing LAB479

Referral/Sendouts, Southeast Michigan, Southwest Michigan, West Michigan

Primary Reference Lab Change to Quest Diagnostics

Effective November 19, 2025

Corewell Health Laboratory is transitioning to Quest Diagnostics as our primary reference testing laboratory. This change means that nearly all referral and send-out tests will now be performed by Quest Diagnostics. A limited number of tests will continue to be sent to other laboratories to ensure we meet the needs of our patients and clinicians.

What You Need to Know:

  • Test Crosswalks: Tests currently performed at ARUP and Mayo Clinic Labs will be matched to comparable tests at Quest Diagnostics.
  • Discontinued Tests: Tests with low utilization or those no longer deemed clinically necessary will be discontinued.
  • New LAB Numbers: All tests will receive new LAB numbers, which must be updated in your EMR compendium if interfaced.
  • Collection Devices: Some tests may require different collection devices.
  • Transition Timeline:
    • November 19, 2025: Focus on tests currently referred to ARUP.
    • December 17, 2025: Focus on tests currently referred to Mayo Clinic Labs.
  • Crosswalk Resources: Crosswalks between current and future test offerings will be provided to help you prepare.
  • Test Directory Access: Please refer to your regional Lab Test Directory for details on specific test changes. ARUP and Mayo Clinic Lab test pages will include links to the corresponding Quest Diagnostic tests.

We understand the significance of these changes and are committed to supporting your practice throughout this transition. Updates and modifications will be communicated promptly.

Contact Information:

  • Corewell Health East Sendouts: 248.551.9045
  • Corewell Health West Referrals: 616.267.2753
  • Or use the Contact Us link above.
Southeast Michigan

Discontinuation of Pearl Top Tube Utilization

Updated 10/1/2025

Effective 10/1/2025, 5 mL Pearl top tubes will no longer be utilized for high sensitivity troponin testing at Corewell Health East Laboratories. In lieu of pearl top tubes, 4 mL lavender top tubes will be the preferred tube type for High sensitivity troponin testing. Should a Pearl top tube be sent for high sensitivity Troponin testing, it will still be accepted and testing performed.

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